Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Mexican Marigold Leaf (Tagetes lucida) contains bioactive flavonoids—quercetin, rutin, and kaempferol glycosides—along with coumarins such as herniarin and dimethylfraxetin, which collectively demonstrate potent in vitro antioxidant activity (DPPH, FRAP, ABTS radical scavenging) and competitive α-glucosidase inhibition (reported IC₅₀ range 61–118.8 µM for kaempferol glycosides). Although no large-scale human clinical trials have been indexed in PubMed to date, extensive peer-reviewed phytochemical analyses published in journals such as the Journal of Ethnopharmacology, Phytochemistry, and Molecules confirm its rich polyphenolic profile and traditional use as a digestive, anxiolytic, and anti-inflammatory botanical.
Reported Benefits (Provisional)
Origin & History
Mexican Marigold (Tagetes lucida), also known as Mexican Tarragon, is an aromatic herb native to the highlands and hillsides of Mexico and Central America. Its leaves are traditionally valued for their digestive, respiratory, and calming properties.
Research Narrative (Provisional)
No large-scale randomized controlled trials specifically investigating Tagetes lucida leaf in human subjects have been indexed in PubMed to date, and therefore no specific PMIDs from clinical studies can be cited. However, multiple peer-reviewed phytochemical investigations published in the Journal of Ethnopharmacology, Phytochemistry, Molecules, and the Journal of Natural Products have characterized quercetin, rutin, kaempferol glycosides, herniarin, dimethylfraxetin, and estragole-rich essential oils as the principal bioactives of the leaf. These studies have confirmed significant in vitro antioxidant capacity via DPPH, FRAP, and ABTS assays, as well as α-glucosidase inhibitory activity comparable to the pharmaceutical reference acarbose. Ethnopharmacological surveys across Mexico and Central America consistently document traditional use for gastrointestinal complaints, anxiety, and fever, providing a strong ethnobotanical basis for further clinical investigation.
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
- Phytochemicals: Flavonoids (quercetin, rutin), Essential oils (thiophenes, terpenes), Carotenoids (lutein, zeaxanthin), Saponins, Glycosides - Minerals: Calcium, Magnesium, Potassium
Reported Mechanism (Provisional)
Kaempferol glycosides isolated from Tagetes lucida competitively inhibit intestinal α-glucosidase at the brush-border membrane (IC₅₀ 61–118.8 µM), delaying oligosaccharide hydrolysis and attenuating postprandial glycemic excursions in a manner mechanistically analogous to acarbose. Quercetin and rutin exert antioxidant effects by donating hydrogen atoms to neutralize DPPH, ABTS⁺, and peroxyl radicals, while chelating transition metal ions (Fe²⁺, Cu²⁺) to prevent Fenton-type hydroxyl radical generation. The coumarins herniarin and dimethylfraxetin inhibit cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) expression, reducing pro-inflammatory prostaglandin E₂ and nitric oxide production in activated macrophages. The essential oil, rich in estragole and methyleugenol, modulates GABAergic neurotransmission, which is believed to underlie the plant's traditional anxiolytic and sedative properties observed in preclinical rodent models.
Clinical Narrative (Provisional)
Current evidence for Mexican Marigold Leaf is primarily based on in vitro studies and traditional use data, with limited controlled human trials available. Laboratory studies demonstrate α-glucosidase inhibition by leaf extracts, with kaempferol O-rhamnoside showing the most potent activity at IC50 61 μg/ml. Animal studies support antioxidant and anti-inflammatory properties, but clinical efficacy in humans requires further investigation. The evidence strength is moderate for traditional digestive and respiratory applications but lacks robust Phase II/III clinical trial data.
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